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Error: “Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance <instance_id>. Last exception: Binding failed for port. ucode: 500” while launching a VM in OpenStack Mitaka. If you are stuck with a similar issue, here’s how you can solve it.

Solution:

In addition to the above error message, look out for more information in neutron log files. For instance, neutron-server.log contained “WARNING neutron.plugins.ml2.drivers.mech_agent [id] Port <id> on network <id> not bound, no agent registered on host cloudcomputenode5“.

The above error hints that the neutron network agent in the compute node (cloudcomputenode5, in my case) does not seems to be present/bind to the request. To solve this, check all the necessary configurations related to neutron agent in the compute node.

Make sure the below configurations are present in the compute node.

1. Check if neutron-linuxbridge-agent‘ is installed. If not, install it as shown below:

#apt-get install neutron-linuxbridge-agent

2. Ensure the below configurations are present in /etc/neutron/neutron.conf.